Tellurians, an older creation, will be making it into the RevForge universe, and will probably have a large role in the lore.
Here’s some of the earlier concept art for two of the three “genders” (tellurians are actually all hermaphroditic).
Backstory: Having had very little access to ferromagnetic materials on their home planet, the vast bulk of their technology is biological in nature. Machines are actually genetically engineered creatures with little-to-no higher cognitive functions. Imagine a coffee table that moves on its own and is covered in human-like skin, and you’ve got the basic idea. Biotech becomes so common that literally everything surrounding these creatures is alive, but it’s mundane to them and they take it for granted the same way we do our own technology. Their cities are massive fluid-filled sacs resembling organs, their homes giant cells that can be altered dynamically by tinkering with the nucleus, or reproduced through a sort of mitosis. To look at a tellurian city would be like looking inside an animal body with a powerful microscope.
The “monarch” caste of the tellurian species (pictured above), in the early timeline, may have been considered by our current gender paradigms to have generally “female” traits (as a funny side-note, the original drawing actually had breasts… I eventually decided to remove them as they didn’t make evolutionary sense in a species with no biological analog to our own mammary glands).
Their larger gaster contains a much more efficient reproductive system, allowing them to carry more offspring at one time. In the total span of their lifetime, monarchs are also capable of producing more eggs than the other two natural castes. Because of these traits, they were more highly valued in early tellurian society, kept deep in communal cell blasticists with a clutch of protective soldier-caste tellurians (to be illustrated later).
Monarch brains are much larger than the other two castes, and because of their close life-long contact with other tellurians in the community, they usually develop a much keener understanding of the finer mechanisms of their society. As such, they quickly elevate themselves to a ruling position.
Physically, monarch are stronger than both drones and soldiers. Because of their great bulk, however, they also tend to be much slower moving and, consequently, more vulnerable.
In the later tellurian timeline, monarchs become much more common and selectively preferable for reasons besides just reproductive viability. Their gasters shrink considerably, and increased mobility allows them to integrate with the rest of tellurian society just as any other caste can (though they still tend to hold the more powerful executive and management positions and roles).
Drones are what could be considered a typical “male” manifestation of the tellurian species, at least in the early tellurian timeline. While there are different pairings of multiple chromosomes (tellurians are triploidy, and have a number of natural and artifical “genders”), all tellurians are capable of both fertilization and bearing children… that is to say, they are all hermaphroditic.
“Gender” is more a state of mind than it is a physiological distinction. Members of each morphological caste are capable of bearing what we might consider to be male or female traits. Later in the tellurian timeline, such traits become almost completely homogeneous, regardless of caste.